EN 927-2:2014

SLOVENSKI STANDARD
01-november-2014
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SIST EN 927-2:2006
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Paints and varnishes - Coating materials and coating systems for exterior wood - Part 2:
Performance specification
Beschichtungsstoffe - Beschichtungsstoffe und Beschichtungssysteme für Holz im
Außenbereich - Teil 2: Leistungsanforderungen
Peintures et vernis - Produits de peinture et systèmes de peinture pour le bois en
extérieur - Partie 2 : Spécifications de performance
Ta slovenski standard je istoveten z: EN 927-2:2014
ICS:
71.100.50 .HPLNDOLMH]D]DãþLWROHVD Wood-protecting chemicals
87.040 Barve in laki Paints and varnishes
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD
EN 927-2
NORME EUROPÉENNE
EUROPÄISCHE NORM
September 2014
ICS 87.040 Supersedes EN 927-2:2006
English Version
Paints and varnishes - Coating materials and coating systems
for exterior wood - Part 2: Performance specification
Peintures et vernis - Produits de peinture et systèmes de Beschichtungsstoffe - Beschichtungsstoffe und
peinture pour le bois en extérieur - Partie 2: Spécifications Beschichtungssysteme für Holz im Außenbereich - Teil 2:
de performance Leistungsanforderungen
This European Standard was approved by CEN on 25 July 2014.

CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European
Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national
standards may be obtained on application to the CEN-CENELEC Management Centre or to any CEN member.

This European Standard exists in three official versions (English, French, German). A version in any other language made by translation
under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC Management Centre has the same
status as the official versions.

CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,
Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania,
Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and United
Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION

EUROPÄISCHES KOMITEE FÜR NORMUNG

CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels
© 2014 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 927-2:2014 E
worldwide for CEN national Members.

Contents Page
Foreword .3
Introduction .4
1 Scope .5
2 Normative references .5
3 Terms and definitions .6
4 Performance tests – Testing profiles.6
5 Test overview .7
5.1 Natural weathering.7
5.1.1 General .7
5.1.2 Performance criteria .7
5.1.3 Exposure conditions .8
5.1.4 Natural weathering – Alternative substrates .8
5.1.5 Natural weathering – Alternative test piece .8
5.2 Existing test methods .8
5.2.1 Water permeability .8
5.2.2 Artificial weathering .9
5.2.3 Knot staining .9
5.2.4 Tannin staining .9
5.2.5 Microfoam .9
5.2.6 Film extensibility .9
5.2.7 Blocking .9
5.2.8 Impact test .9
5.2.9 Fungal and algal growth . 10
5.3 Test methods in preparation . 10
5.3.1 Wet adhesion (parallel cross-cut test) . 10
5.3.2 Wet adhesion (pull-off test) . 10
5.3.3 UV transmittance . 10
5.3.4 End grain sealing . 10
6 Summary of test methods and reporting convention . 10
7 Expression of results and claiming conformity – Scope and reporting convention . 11
Bibliography . 13

Foreword
This document (EN 927-2:2014) has been prepared by Technical Committee CEN/TC 139 “Paints and
varnishes”, the secretariat of which is held by DIN.
This European Standard shall be given the status of a national standard, either by publication of an identical
text or by endorsement, at the latest by March 2015, and conflicting national standards shall be withdrawn at
the latest by March 2015.
Attention is drawn to the possibility that some of the elements of this document may be the subject of patent
rights. CEN [and/or CENELEC] shall not be held responsible for identifying any or all such patent rights.
This document supersedes EN 927-2:2006.
The following significant technical changes have been made with respect to EN 927-2:2006:
a) test profiles for the three main end-use categories (as defined in EN 927-1) have been updated to include
additional test methods;
b) Annex A has been deleted; further information on test methods is found in Clause 5, or the referenced
test methods themselves.
EN 927 consists of the following parts under the general title: Paints and varnishes — Coating materials and
coating systems for exterior wood
— Part 1: Classification and selection;
— Part 2: Performance specification;
— Part 3: Natural weathering test;
— Part 5: Assessment of the liquid water permeability;
— Part 6: Exposure of wood coatings to artificial weathering using fluorescent UV lamps and water.
According to the CEN-CENELEC Internal Regulations, the national standards organizations of the following
countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech
Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece,
Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal,
Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom.
Introduction
This European Standard is one of a number of parts of EN 927. EN 927-1 addresses the issue of terminology
for the wide variety of exterior coatings for wood that are now available. EN 927-1 also provides a framework
for communicating information on the suitability of a coating for particular specific end-use categories.
Improved communication is beneficial in the removal of technical barriers to trade. However, there remains the
problem of comparing products tested, or likely to be exposed, in different climatic regions, and the relevance
of tests for different categories of end-use. EN 927-2 addresses these issues and sets a limited number of
mandatory performance criteria combined with optional tests that can provide additional information to a
standardized format.
1 Scope
This part of EN 927 addresses performance criteria for coating systems on exterior wood. Performance
requirements are specified according to three categories of end use (defined in EN 927-1) in terms of two
mandatory tests namely natural weathering performance testing carried out in accordance with EN 927-3, and
water permeability in accordance with EN 927-5. Additional optional tests (non-mandatory) are tabled which
may be used by suppliers, or for specification purposes, to provide additional information, to a standardized
format, on aspects of performance relevant to specific situations. The majority of test methods are drawn from
EN 927 (all parts), but where relevant additional tests from other national and international sources are used.
Requirements for claiming conformity with EN 927-2 are defined and provide flexibility for different situations
and can also provide a basis for certification.
2 Normative references
The following documents, in whole or in part, are normatively referenced in this document and are
indispensable for its application. For dated references, only the edition cited applies. For undated references,
the latest edition of the referenced document (including any amendments) applies.
EN 927-1:2013, Paints and varnishes - Coating materials and coating systems for exterior wood - Part 1:
Classification and selection
EN 927-3:2012, Paints and varnishes - Coating materials and coating systems for exterior wood - Part 3:
Natural weathering test
EN 927-5, Paints and varnishes - Coating materials and coating systems for exterior wood - Part 5:
Assessment of the liquid water permeability
EN 927-6, Paints and varnishes - Coating materials and coating systems for exterior wood - Part 6: Exposure
of wood coatings to artificial weathering using fluorescent UV lamps and water
EN 16492, Paints and varnishes - Evaluation of the surface disfigurement caused by fungi and algae on
coatings
CEN/TS 16358, Paints and varnishes - Coating materials and coating systems for exterior wood - Assessment
of air inclusions/microfoam in coating films
CEN/TS 16359, Paints and varnishes - Coating materials and coating systems for exterior wood - Assessment
of knot staining resistance of wood coatings
CEN/TS 16360, Paints and varnishes - Coating materials and coating systems for exterior wood - Assessment
of film extensibility by indentation of a coating on a wooden substrate
CEN/TS 16498, Paints and varnishes - Coating materials and coating systems for exterior wood - Assessment
of tannin staining
CEN/TS 16499, Paints and varnishes - Coating materials and coating systems for exterior wood - Resistance
to blocking of paints and varnishes on wood
CEN/TS 16700, Paints and varnishes - Coating materials and coating systems for exterior wood - Assessment
of resistance to impact of a coating on a wooden substrate
EN ISO 4618:2006, Paints and varnishes - Terms and definitions (ISO 4618:2006)
EN ISO 4628-1, Paints and varnishes - Evaluation of degradation of coatings - Designation of quantity and
size of defects, and of intensity of uniform changes in appearance - Part 1: General introduction and
designation system (ISO 4628-1)
EN ISO 7783, Paints and varnishes - Determination of water-vapour transmission properties - Cup method
(ISO 7783)
3 Terms and definitions
For the purposes of this document, the terms and definitions given in EN 927-1:2013 and EN ISO 4618:2006
apply.
4 Performance tests – Testing profiles
EN 927-1 classifies exterior wood coatings according to appearance (75 possibilities) and three broad end-
use categories. Assessment of performance is carried out with reference to the end-use categories, which are
grouped according to the extent to which wood movement shall be controlled. Performance will be strongly
influenced by appearance (e.g. transparent versus opaque), by substrate (e.g. wood species) and by climatic
and exposure conditions. It is open to suppliers or end-users to agree a combination of tests (see Table 1 and
Table 2) tha
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